Abrading tool



April 23, 1929. a. EsmFALcom ABRADING TOOL Filed Jan. 14, 1926 A TTORNE Y5.

Patented Apr. 23, 1929.

UNITED STATES GIUSEPPE GRIFALCONI, OF LARCI-IMONT, NEW YORK.

ABRADING TOOL.

Application filed January 14, 1926. Serial No. 81,254.

v This invention relates to abrading tools and has reference more partlcularly to abrading tools for various purposes in which an abrasive sheet such as sandpaper, emery cloth or other fabric is removably held to the surface of the tool and applied to the article to be treated. The invention is useful for abrading and cleaning various articles, and to be applied either by power or by hand.

The general object of the invention 1s to provide an abrading tool of the kind referred to which will be more efficient, simple and con venientthan prior known abrading tools. Other and more detail objects and advantages will be pointed out in the hereinafter following description or will be apparent to those conversant with the subject.

For purposes of illustration the invention is shown as embodied in a hand operable implement adapted for renewing the electrical contacts in the distributor box of an ignition system, for example for automobiles, such contacts being located at the interior of a circular cavity, to which eflicient access can be had with the present invention. To the ac complishment of the objects and advantages referred to the present invention consists in the novel abrading tool and the novelfeatures of construction, combination, arrangement and detail herein described or illustrated.

Fig. 1 is a perspective view showing one form of embodiment, along with a distributor box to be operated. Fig. 2 is a side elevation of the abrading tool, with the handle omitted, and shown partly in cross section. Fig. 3 is a rear face view. tion taken on-the line fr-"4: of Fig. 3, the tool indicated in grinding position in the distributor box. of the retaining clips detached.

The member forsupporting the abrasive sheets consists of a disk 10 which is usually flat at its outer or operative side. The disk maybe of a generally circular form and is adapted to be rotated by means of a central or axial mounting. Thus the rear side of the disk is formed with a boss 11, by which it may be held in a clutch or holder for power operation, and beyond the boss is shown a stem 12 which may be inserted in a shank or handie 13 which holds or clutches the stem. This enables the article to be employed as a hand operated implement, the handle or shank being conveniently turned by hand to rotate the disk. The handle is shown formed with a recess 14 constituting an interior chamber,

Fig. 1 is a transverse sec-' F ig; 5 is a perspective of one closed by a screw cap 15, the recess containing suitable Wrenches or other tools convenient to have handy in connection with the abrasive tool.

The article 18 to which the present invention is shown applied is that part of an ignition system known as the distributor casing, comprisinga cylindrical wall 19 and an interior circular bottom 20 in'which bottom are located a series of contact points 21, to be abraded and cleaned for electrical contact purposes. A central carbon point 22 is shown. whichalso will be cleaned and abraded by this invention.

Referring again to the supporting disk 10, on which the abrasive sheet 23 is mounted, this is shown. as having its opposite sides truncated at 24;, the cut off portions affording space within the original outline for the attaching means to be described. The edge of each truncated side 24: is shown concaved or recessed at25 for the purpose of receiving the margin of the abrasive sheet and a holding means or clasp by which the sheet can be removably secured to the disk. Preferably spring clips 26 are employed for this purpose so as to give resilience and to enable the clip to be snapped into place. The inner or rear end of each spring clip is preferably hinged at 27 as shown, namely, upon ears 28 formed at the back of the disk 10. The free end of each clip is bent in a rounded form 29 so as to press the margin of the abrasive sheet securely into the recess or concave edge 25. This forms a very compact attaching means and one which is easily applied and removed, and which does not extend in front of the abrading plane nor beyond the original or circular outline of the disk.

By this arrangement the abrasive sheet, cut approximately to the original circular form of'the disk, may be readily applied to the disk, bent over the truncated sides 24: thereof, and. secured by the clips 26 against the concave edges 25. The implement'is then in readiness for use. central carbon point 22 the disk is shown as having a central face aperture 31. The carbon point maybreak through the abrasive sheet at the center and will itself receive a certain cleaning or abrading action. 7

It will thus be seen that there has been described an abrading tool embodying the principles and attaining the objects of the present invention, but as many matters of design, arrangement. and construction may be vari- To accommodate the I ously modified Without departing from the principles, it is not intended to limit the invention to such matters except so far as set forth in the appended claims.

What is claimed is:

A portable abrading implement for hand use comprising a handle for rotating it, and a flat faced disk upon the end of the handle; the disk being of generally circular contour but having a plurality of truncated sides over the edges of Which the margins of an abrasive sheet may be bent, and said disk :torn'ied With concave edge recesses at such truncated sides, and spring clips mounted swingingly upon 15 the rear of the disk adjacent each truncated head. at its free end positioned to enter and snap into the concave recess of the disk edge for removably holding the abrasive sheet margin, and said head being of such small dimension to lie Wholly behind the plane of the Working Face of the disk and inside of the generally circular contour thereof; and the handle being connected axially to the circular shape oi? the disk and itself being circular to "facilitate the manual spinning of the entire implen'ient.

In testimony whereof, I have aliixed my sig nature hereto.

GIUSEPPE GRIFALCONI. 

